tourism ocean promontory Rozanne Hakala basalt South Iceland coastline sand tide tourist sudurland cliffs Todd landscape cape Ísland Doorway Hill Island mýrdalssandur Iceland coast Vatn suðurland water camera mist photographer Dyrhólaey Mýrdalur lava sandur eyja fjara beach nature sanctuary geology North Atlantic headland Portland seascape volcanic sea black sand South Coast clouds outdoors waves rain rocks surf